| Director | Kunal Kohli |
|---|---|
| Genre | musical comedy, musical film, romantic comedy |
| Runtime | 136 min |
| Country | India |
| Budget | ₹8 crore |
| Box office | ₹42.6 crore |
Karan Kapoor, a cartoonist known for his comic strip "Hum Tum," which humorously explores gender dynamics, meets Rhea Prakash, a strong-willed and practical woman, on a flight from Delhi to New York City. During a layover in Amsterdam, they briefly tour the city together, but their clashing personalities lead to friction. The encounter ends when Karan, misreading her boundaries, kisses Rhea without consent, prompting her to slap him. Before parting, Karan insists they will meet again.
Six months later in New York, Karan encounters Rhea once more—this time through his girlfriend Shalini, who is revealed to be Rhea's childhood friend. The awkward situation leads to Karan and Shalini breaking up. Three years later, Karan runs into Rhea in Delhi while assisting his mother with wedding preparations, only to discover Rhea is the bride. She is marrying Sameer, and although their meeting begins with friction, they part amicably.
Another three years pass before they meet unexpectedly in Paris, where Karan learns from Rhea's mother, Parminder "Bobby" Prakash, that Sameer died in a car accident shortly after their first anniversary. Karan, moved by Rhea's grief, resolves to help her heal.
Back in Mumbai, Karan attempts to set Rhea up with his introverted friend Mihir Vora, believing she needs someone stable. However, Mihir falls in love with another woman, Diana Fernandez, and they become engaged. On the engagement night, Rhea discovers Karan's matchmaking scheme and confronts him. Mihir later helps Rhea realise that she has fallen in love with Karan. That night, she and Karan sleep together.
The next morning, Karan, overwhelmed by guilt, proposes marriage to Rhea to “make things right,” but Rhea is hurt by his framing of their intimacy as a mistake. She leaves him, refusing to marry for the wrong reasons. Karan later realises his error and attempts to reconcile, but is unable to find her.
One year later, Karan's comic strip has become widely successful, and he publishes a book about "Hum" and "Tum," mirroring his relationship with Rhea. At the book's launch, Rhea reads the story and realises Karan's love for her. They reconcile and eventually marry. The film concludes with them as parents to a baby girl, as Karan jokingly laments about a baby boy in the next crib, predicting another future "Hum Tum" romance.